On Thu, 23 Feb 2006 14:45:29 +0100, Chris Mason <[EMAIL PROTECTED]> wrote:
>... >There was an issue with VIPAs and OMPROUTE OSPF dynamic routing. Ideally it >should be possible to advertise a VIPA using a "host", single (the VIPA >itself) address rather than a subnet range. When I examined setting this up >in 2001, the last time I consulted on this topic, I seem to recall this >ideal was not possible. Has anything changed or is it still necessary to >assign, say, 4 addresses to each dynamic VIPA in order to advertise >availability of individual dynamic VIPAs outside the LPAR? Of course, the >waste may not really be a problem when assigning addresses from, say, >network 10 in an intranet. >... Chris, If I understand the issue here I asked that same kind of question 4 years ago or so when setting up an OSPF config. I think I was told by Mike Fox (OMPROUTE developer) that OSPF works on subnets and there wasn't any way to get away from subnet advertisements. (At least that's what I thought he said.) Since then a parm Advertise_VIPA_Routes has appeared, and it can be set to HOST_ONLY. If you put that parm on all OMPROUTE's VIPA defs the VIPA subnet won't be advertised. I sure wish I had that at my last shop. All our VIPAs were in the same subnet spread across 7 LPARs. If a dynamic VIPA was not currently defined and some external host tried to find it the packet would be perpetually routed from host to host. (I don't have that addr, but he has that subnet; try him.) :-( Pat O'Keefe ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
